Blue Ocean Riserless Intervention System (BORIS)
Riserless Light Well Intervention (RLWI) Solution
Oceaneering provides cost-effective, RLWI solutions for down-hole intervention, well stimulation, well remediation, and plug and abandonment of subsea wells.
The Blue Ocean Riserless Intervention System (BORIS) is deployable from a range of hosts including dynamically positioned multi-purpose service vessels (MPSVs) and mobile offshore drilling units (MODUs) and is fully ROV compatible. It incorporates a decade’s worth of engineering improvements on our IRIS offering and includes future- proofing features to meet anticipated regulatory requirements.
Riserless Light Well Intervention (RLWI) System Overview
Our wireline-based, riserless intervention capabilities supplement our hydraulic intervention solutions and:
（1） enable us to provide nimble solutions with ultimate flexibility and cost-effectiveness.
（2） deliver improved work-over economics with systems that let the operator complete more work, some previously not viable due to costs, reliably.
（3）support activities including the opening and closing of sleeves, setting and pulling plugs, and cutting of paraffins.
（4）Fully functional at both high and low pressures to support life of field applications from green field
development through brownfield operations to decommissioning.
（5） support intervention in areas in close proximity to production facilities or where a fatigued wellhead or tree is involved.
Our RLWI systems include topside fluid handling equipment, fluid conduits, slickline/wireline units,
and a subsea well control package. The systems can be used to perform the following typical down-hole well interventions on horizontal and vertical trees:
（1）Well stimulation and remediation
（2）Crown plug installation and removal
（3）Real-time wellbore logging during production
（4）Through tubing cast iron bridge plug installation
（5）Plug back
（6）Temporary plug setting and recovery
（7）Sleeve shifting and fishing operations
（8）Straddle isolation/tubing patches
（9）Plug and abandonment
（10）Deployment of specialized down-hole diagnostic and remediation tooling via slickline or wireline (e-line and braided)
Benefits
（1）Cost-effective, highly-reliable riserless well intervention system
（2）Patented, field-proven pressure control technology
（3）Global RWLI operations from vessel of opportunity
（4）Lower assembly has 13 5/8 in bend capacity well/tree.for contingency riser package landout
（5）MUX-controlled flushing valve sequence (with ROV backup)
（6）Clamp spool connection for ease of connector change out
（7）MUX control skid is retrievable, if required, leaving BORIS well control in place on the well/tree
Blue Ocean Interchangeable Riserless Intervention System (BORIS)
Delivering subsea well control
The BORIS subsea well control package provides customers with a light, portable system for completing RLWI. Its field proven technology builds on its predecessors the IRIS apabilities which delivered industry-first results in deepwater applications. Globally deployable from a vessel of opportunity, BORIS provides additional flexibility, cost savings, and ensures customers can complete operations where and when they are required.
The System
The BORIS is comprised of three connectable sections; a lower well control module, an upper well control module, and a lubricator section. The upper and lower modules are deployed as one with the capability to be disconnected subsea via ROV operated connectors in contingency riser operations.
The upper and lower assemblies comprise of the following main components.
The upper module houses a shear-seal blowout preventer (BOP), a gate valve, and an Oceaneering proprietary wireline grease system with clamp connectors top and bottom.
The lower module contains an additional gate valve, safety head shear seal BOP, and two side outlets with dual gate valves on each. As well as a spool to allow clamp connection to project specific connectors and critical function redundancy MQC umbilical interfaces.
The lubricator is the third component of the system and houses a subsea pressure control head with integral subsea pack-offs and the relevant well intervention tool strings. Wireline tool deployment and recovery is completed through the host moonpool with the aid of ROVs.
Increasing Functionality
BORIS provides diverse functionality via its interchangeable wireline tool string. The tool string is changed by unlatching the lubricator assembly from the upper well control module and recovering it to the surface together with the tool string. BORIS is capable of being field configured to run slickline or e-line to meet the demands of varied well conditions and applications.
All BORIS functions are controlled through a MUX system housed on a subsea control skid via a dedicated electro-hydraulic umbilical. The subsea control skid is equipped with dual-redundant control pods for surface control of essential BORIS functions. These functions can be hydraulically controlled with ROV operated valves or through a separate electrical downline.
All barriers and system functions are equipped with ROV overrides.
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